Holdback



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(No Model.)

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Pateted July 4; l1893.

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UNITED STATES PATENT OFFICE.

GEORGE C. EDMUNDS, OF ROCHESTER, ASSIGNOR OF ONE-I-IALF kTO FRANK G.RAMSDELL, OF MACEDON CENTRE, NEW YORK.

y HOLDBACK.

SPECIFICATION forming part of Letters Patent No. 501,003, dated July 4,1893.

Application iiled October 19, 1892. Serial No. 449.352. (No model.)

To aZZ whom it may concern:

Be it known that I, GEORGE C. EDMUNDS, of Rochester, in the county ofMonroe and State of New York, havein vented a certain new and usefulImprovement in Holdback Attachments for Harness; and I do hereby declarethat the following is a full, clear, and exact description of the same,reference being had to the drawings accompanying this specification.

My improvement relates to that class of hold backs in which a socket isused attached to the thill and a pin rests in the socket, which pin isself tightening under back strain but is removable under front strain,so that in case of breakage or detachment of the tug the couplingseparates and releases the horse from the thills.

The invention consists in the special construction and arrangement ofthe coupling ashereinafter described and claimed.

In the drawings-Figure 1 is a side elevation of a portion of a thillshowing my improvement attached thereto. Fig.2 is asi milar view showingthe attachment and a portion of the thill in longitudinal section. Fig.3 is a cross section of the thill and an end elevation of theattachment. Figa is across section of the attachment in line oc of Fig.l. Fig.' 5 is a perspective View of the pin.

A indicates the thill.

B is the socket and C the pin. The socket is made of cast metal of halfcircular form in cross section and flat on one side, by which it can betitted to the thill and secured thereto by screws a c which pass throughlugs b b. Preferably it is attached on the under side of the thill asshown, but it may be attached on the upper side. The flat face is formedwith a series of corrugations c c, by which means when in place it holdsbetter and also serves to discharge any water which may enter. It alsohas a small discharge hole c in its closed end. Theinteriorof thesocketis constructed with an enlarged half circular opening cl in its bottomand a contracted slot d in its top for the fitting of the pin andspring, as will presently be described.

The pin C consists of a straight shank f and a loop or ring g at itsouter end. The shank f is half circular in cross section to Iill 5o theenlarged opening d, and is provided with an upwardly projecting flange hwhich rests in the narrow opening d. By this means it can be insertedendwise into the socket but is prevented from turning axially. When so 51 fitted in place the loop or ring g only projects, and this loop orring serves as the attachment for the hold back strap. The back strainof this strap holds the pin in the socket,

while the front strain when the horse is re- 6o leased draws it out.

D is a iiat spring resting in the narrow opening d of the socket. It isattached at its front end by being clamped between the lug of the socketand the body of the thill. Its rear end is free and rests against thethill. The central part is bent down forming a bow k, with inclines onboth sides. The iiange h of the pin is formed with a correspondingdepression Z in which the bow of the spring 7o rests. The end of thedange is also provided with a double inclined cam fm. When the pin isinserted in place the cam m strikes the spring, raises it and passesbeyond it and the spring holds the pin in place against any accidentaldisplacement yet yields under sufficient pressure to allow withdrawal ofthe pin.

Having described my invention, I do not claim broadly a socket and pin.

What I claim as new, and desire to secure 8o by Letters Patent, is-

In a hold back attachment, the combination of the socket B constructedwith the eularged opening d and slot d', the fiat spring D resting insaid slot and provided withl the central bow 7c and the pin Cconstructedwith 'the flange h provided with the depressioni and double sided cam m,as shown and described and for the purpose specified. Y

In witness whereof I have hereunto signed 9o my name in the presence oftwo subscribing witnesses. p l

G. C. EDMUNDS. Witnesses:

R. F. OSGOOD, CEAS. A. WIDENER.

